We provide 24 options of unvented direct, indirect and solar cylinders (400, 500, 800, 1000, 1250, 2000 and 2500 litre models available in each category). Optional immersion heater units also available to provide boost and backup. Using high-performance coils, the cylinders can recover from cold in less than 60 minutes in optimum conditions, making them particularly suitable for the hotel, leisure and housing sectors.

Manufactured from Duplex 2205 stainless steel, a high specification grade with a proven level of high-performance and around twice the proof strength of standard 304 and 316 types - perfectly equipped to deal with system pressures. Our hot water cylinders deliver long, trouble-free service life thanks to excellent corrosion resistance, stress corrosion cracking resistance and pitting resistance properties of the dual ferritic-austentic steel.

  • Exceptional flow rates - In excess of 100 litres a minute
  • High-performance coils -– Can recover from cold in under 60 minutes
  • Manufactured from Duplex 2205 stainless steel - High-performance, twice the proof strength of 304 and 316 stainless steel
  • Excellent corrosion resistance, stress corrosion cracking resistance and pitting resistance - Durable and long, trouble-free service life
  • Suitable for new build and existing buildings with year-round heat demands - Flexible solution to sustainable heat and power
  • Full unvented hot water kit and 6bar operating pressure supplied as standard - Easy installation
  • Fully insulated with 100mm of polyurethane foam - Reduced heat loss and pollution, lower fuel bills
  • Meets all British environmental legislation and regulation standards - Includes the recommendations of HSE Document L8 relating to Legionella Pneumophilia

LITERATURE FOR HOT WATER CYLINDERS

Download the latest literature for Hot Water Cylinders by clicking the links below.

TECHNICAL INFORMATION

Click to download the technical specification for the Indirect, Direct and Solar Calorifiers in PDF format

 

400 Indirect

500 Indirect

800 Indirect

1000 Indirect

1250 Indirect

2000 Indirect

2500 Indirect

Max direct kW rating

24 24 45 45 56 56 56

Direct heat time (based on max kW rating in mins)

52 66 56 70 73 117 146

Coil surface area m2

2 2 3 3 5 7.5 7.5
Coil rating (kW) 15 l/min
29.4 28.7 31.3 32.9 35 40.2 37.5
Coil rating (kW) 30 l/min 43.6 41.8 52.7 51.4 63.6 98.4 86.4
Coil rating (kW) 60 l/min
59.7 55.8 76.9 76.5 97.9 132.2 126.4
Indirect heat time (mins) 15 l/min 43 55 80 91 112 180 225 
Indirect heat time (mins) 30 l/min 29 38 48 59 62 99 124
Indirect heat time (mins) 60 l/min 21 28 32 39 40 48 62
Pressure drop through primary coil (Mpa) 15 l/min 0.002 0.002 0.001 0.001 0.001
0.001
0.001
Pressure drop through primary coil (Mpa) 30 l/min 0.004 0.004 0.008 0.008
0.006 0.007 0.007
Pressure drop through primary coil (Mpa) 60 l/min 0.032 0.032
0.044 0.044
0.025 0.03 0.03

Heat loss (kWh in 24h)

1.72 2.14 2.74 3.33 3.60 4.30 4.50

Hot water capacity (volume of water drawn off >40°C

384

482 776 961 1206 1930 2482
Weight full (kg) 505 610 964 1188 1569 2445 2950
Weight empty 105 110 164 188 319 445 450
Max supply pressure 1.6 MPa (16bar) 1.6MPa (16 bar) 1.6MPa (16 bar) 1.6MPa (16 bar) 1.6MPa (16 bar) 1.6MPa (16 bar) 1.6MPa (16 bar) 1.6MPa (16 bar)
Max design pressure 0.8MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar)
Max operating pressure 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar)
Max expansion vessel charge pressure 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar)
Expansion relief valve setting 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar)
0.8 MPa (8 bar)
0.8 MPa (8 bar)
0.8 MPa (8 bar)
0.8 MPa (8 bar)
0.8 MPa (8 bar)
T and P valve setting 1 MPa (10 bar), 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C
Maximum primary pressure (indirect only) 0.3 MPa (3 bar) 0.3 MPa (3 bar) 0.3 MPa (3 bar) 0.3 MPa (3 bar) 0.3 MPa (3 bar) 0.3 MPa (3 bar) 0.3 MPa (3 bar)

Direct

 

400 Direct

500 Direct

800 Direct

1000 Direct

1250 Direct

2000 Direct

2500 Direct

Max direct kW rating 24 24 63 81 84 90 90
Direct heat time (based on max kW rating in mins) 52 66 40 39 47 70 87
Heat loss (kWh in 24h) 1.72 2.14 2.74 3.33 3.60 4.30 4.50
Hot water capacity (volume of water drawn off >40°C) 384 482 776 961 1206 1930 2482
Weight full (kg) 495 600 953 1178 1547 2415 2921
Weight empty (kg) 95 100 153 178 297 415 421
Max supply pressure 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar)
Max design pressure 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar)
Max operating pressure 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar)
Max expansion vessel charge pressure 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar)
Expansion relief valve setting 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar)
T and P valve setting 1 MPa (10 bar), 90-95°C 1 MPa (10 bar), 90-95°C 1 MPa (10 bar), 90-95°C 1 MPa (10 bar), 90-95°C 1 MPa (10 bar), 90-95°C 1 MPa (10 bar), 90-95°C 1 MPa (10 bar), 90-95°C
Solar

 

400 Solar

500 Solar

800 Solar

1000 Solar

1250 Solar

2000 Solar

2500 Solar

Max direct kW rating 24 24 45 45 54 54 54
Direct heat time (based on max kW rating in mins) 52 66 56 70 73 117 146
Coil surface area m2 2 2 3 3 5 7.5 7.5
Auxiliary coil surface area m2 1 1 1.5 1.5 2.5 5 5
Solar coil rating 15 l/min 29.4 28.7 31.3 32.9 35 40.2 37.5
Solar coil rating (kW) 30 l/min 43.6 41.8 52.7 51.4 63.6 98.4 86.6
Solar coil rating (kW) 60 l/min 59.7 55.8 76.9 76.5 97.9 132.2 126.4

Auxiliary coil rating (kW)

28.4 27.2 30.5 33.2 48.6 97.9 91.7
Solar coil heat time (mins) 15 l/min 43 55 80 91 112 180 225

Solar coil heat time (mins) 30 l/min

29 38 48 59 62 99 124
Solar coil heat time (mins) 60 l/min 21 28 32 39 40 48 62
Pressure drop through primary coil 15 l/min 0.002 0.001 0.001 0.001 0.001 0.001 0.001
Pressure drop through primary coil 30 l/min 0.004 0.004 0.008 0.008 0.006 0.007 0.007
Pressure drop through primary coil 60 l/min 0.032 0.032 0.044 0.044 0.025 0.03 0.03
Heat loss (kWh in 24h) 1.72 2.14 2.74 3.33 3.60 4.30 4.50
Hot water capacity (volume of water drawn off >40°C) 384 482 776 961 1206 1930 2482

Weight full (kg)

505 610 964 1188 1569 2445 2950
Weight empty (kg)

105

110 164 188 319 445 450
Max supply pressure 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar) 1.6 MPa (16 bar)
Max design pressure 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar)
Max operating pressure 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar) 0.6 MPa (6 bar)
Max expansion vessel charge pressure 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar) 1.0 MPa (10 bar)
Expansion relief valve setting 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar) 0.8 MPa (8 bar)
T and P valve setting 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C 1 MPa (10 bar) 90-95°C
Maximum primary pressure 0.3 Mpa (3 bar) 0.3 Mpa (3 bar) 0.3 Mpa (3 bar) 0.3 Mpa (3 bar) 0.3 Mpa (3 bar) 0.3 Mpa (3 bar) 0.3 Mpa (3 bar)
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